Analysis & Design of RCC shear walls in the model using ETABS

Aim - to run the analysis and design the RCC shear walls

procedure - 1. open the file in ETABS And run the analysis

2. run analysis on the model

3. run design check

4. select identify PM-failure

5. select display info and choose pier reinforcing ratios

right click on shear walls to get design details as shown

calculation with IS13920-2016

overall height of wall = 21000mm, length of wall=1500mm

given RC wall is slender

from clause 10.8, largest diameter to beused should not exceed 1/10th if thickness of the wall. therefor, 300/10=30mm so thickness of wall=300mm

25mm dia bar is used indetailing so it is within the limit

according to clause 10.9 max spacing of longitudnal transverse rebar should not exceed

1/5th of the horizontal lenght = 300mm 2) 3 times of thickness(tw)=3x300=900mm 3)450mm

we need to adapt spacing of 300mm both for vertical and horizontal rebar inside RC wall

752.4sq.mm for the entire RC wall height which will be 358 sq.mm/meter height of RC wall

minimum horizontal reinforcement calcluation as per table 1 of 1513920 - 2016

(Ph)min = 0.0025 = 0.5 (hw/Lw-2)(Ph-0.0025)

0.01672 of cross section of RC wall

1500x300x0.01672

provide 16mm dia at 100mm c/c which gives 1000/100x2x201=4020sq.mm

minimum boundary reinforcement calculation as per table IS 13920-2016 (Pv,be)min=0.008

0.008x300x300=720 sq.mm

we provide 8 numbers 12mm dia rebar = 904sq.mm

minimum overall RC vertical reinforcement calculation as per table 1 of IS 13920-2016

(Pvnot=t)min=0.0025+0.01375(tw/Lw)

0.00525 times of wall cross section

0.00525x1500x300=2363 sq.mm

provide 24number 12mm dia rebar = 24x113=2712sq.mm

boundary element of special confining reinforcement as per clause 14.4 of IS 13920-2016

Ash=0.05xSvxh(Fck/fy)

as per drawing maximum spacing of confinement is 100mm

h=minimum clear distance between longitudnal rebar = 150mm

so Ash=45sq.mm

we already provided two closed links of 16mm dia=2x201=402sq.mm

conclusion - we have successfull designed the RC wall and verified it fromthe ductility code